This morning’s NPR marketplace included a list of money-saving tips for drivers. Most are spot-on, but one surprised me: the recommendation that everyone use 91 octane premium gasoline.

Numerous sources including the Federal Trade Commission, Scientific American, and the California Energy Commission have debunked the myth that a higher octane rating will give you a performance boost or keep your engine cleaner. Possibly alluding to this, the tip claims that premium gasoline is better “because it’s more filtered, not because of the octane.”

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